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Earth is continuously bombarded by meteorites, with many burning up in our atmosphere before reaching the surface. Significant impacts can occur, leading to potential consequences for life on our planet. It has established with research that the majority of meteorites that land on Earth originate from the asteroid belt, a region located between Mars and Jupiter. This area is populated by irregularly shaped rocks that are remnants of the solar system’s formation. Recent studies have revealed new insights into the specific sources of these meteorites.

Identification of Asteroid Families

A recent study conducted by an international team of scientists suggests that three distinct asteroid families in the main asteroid belt account for approximately 70 percent of the meteorites found on Earth. These families, the Karin, Koronis, and Massalia families, were formed from collisions in the asteroid belt that occurred approximately 5.8 million, 7.5 million, and 40 million years ago, respectively. The Massalia family is estimated to be responsible for 37 percent of all known meteorites.

Methodology of Research

They employed a telescopic survey to analyse the composition of the major asteroid families in the belt. They also used computer simulations to understand the dynamics and evolution of these families over time. Previously, only 6% of meteorites had been definitively linked to celestial bodies such as the Moon, Mars, or Vesta, one of the largest objects in the asteroid belt. The origins of the remaining 94% had been less clear.

Why Younger Families Contribute More Meteorites

The prominence of these younger asteroid families as sources of meteorites can be attributed to their composition. Younger families, having formed from relatively recent collisions, consist of more fragments. This abundance of fragments increases the likelihood that some will escape the main asteroid belt and eventually collide with Earth. Over time, older asteroid families tend to lose their fragments, making them less likely to contribute to meteorite falls.

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Apophis asteroid may see landslides, tremors during its 2029 Earth flyby

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November 6, 2024

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Apophis asteroid may see landslides, tremors during its 2029 Earth flyby

In April 2029, asteroid Apophis will pass exceptionally close to Earth—at just 20,000 miles away, closer than many satellites. The encounter may trigger significant physical changes on the asteroid’s surface due to Earth’s gravitational pull, potentially causing landslides and tremors, according to a recent study. Apophis, a 340-meter, peanut-shaped asteroid named after the ancient Egyptian deity associated with chaos, is not expected to impact Earth. However, this flyby could offer scientists a unique opportunity to observe how gravitational forces affect small celestial bodies.

New Insights into Surface Alterations

The study, currently available on the arXiv preprint database, has been accepted for publication in The Planetary Science Journal. Asteroid scientist Ronald-Louis Ballouz from Johns Hopkins University Applied Physics Laboratory and his team conducted computational simulations of Apophis to predict the changes Earth’s gravity might induce. Ballouz notes that while meteoroids constantly weather asteroid surfaces in space, close planetary encounters can also alter an asteroid’s appearance. The gravitational pull from Earth is expected to disrupt Apophis’ surface by triggering tremors, lifting rocks, and creating visible patterns.

Predicted Surface Shifts and Landslides

The team’s models suggest that Apophis will experience surface tremors starting an hour before it reaches its closest approach to Earth, potentially dislodging boulders. Although Apophis’ own gravity is weak, this gravitational “shaking” could loft rocks briefly before they fall back, forming new surface features. Additionally, Apophis’ irregular rotation, or “tumbling,” might accelerate or slow down due to Earth’s gravitational influence. These shifts in tumbling could further destabilise rocks over time, potentially leading to gradual landslides that shape the asteroid’s surface over tens of thousands of years.

Future Observations with NASA’s OSIRIS-APEX Mission

Scientists hope to verify these findings when NASA’s OSIRIS-APEX spacecraft studies Apophis in 2029. Repurposed from its earlier mission to the asteroid Bennu, OSIRIS-APEX is set to examine Apophis’ chemical composition and surface features over an 18-month mission. This research could help solve longstanding questions about how gravitational encounters refresh asteroid surfaces, providing new insights into asteroid dynamics and planetary formation processes.

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Could a hidden planet beyond Neptune be altering the solar system?

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November 6, 2024

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Could a hidden planet beyond Neptune be altering the solar system?

Astronomers may be on the brink of uncovering a ninth hidden planet in our solar system. As theories surrounding its existence gain momentum, the hypothetical planet, often referred to as “Planet Nine,” is suspected to be located far beyond Neptune, in the Kuiper Belt. The Kuiper belt is a region filled with icy objects orbiting the Sun. Though no direct observation has been made, researchers have observed peculiar gravitational anomalies in the Kuiper Belt, suggesting the influence of an unseen, massive object.

Evidence for Planet Nine’s Existence

The potential existence of Planet Nine first gained scientific traction in 2016. It was when Michael Brown and Konstantin Batygin, professors at the California Institute of Technology, proposed that an unseen planet could explain the unusual orbits of certain Kuiper Belt objects. They theorised that the gravitational pull of this planet may be altering the paths of these distant bodies. Brown was also involved in the reclassification of Pluto as a dwarf planet, suggested that Planet Nine could be significantly larger than Earth, possibly ten times its mass.

Tracking the Unseen Planet

Efforts to locate Planet Nine are ongoing, with multiple observatories around the world dedicating resources to the search. Advances in telescope technology and data analysis have provided scientists with more tools to investigate this mystery, though tracking such a distant and faint object remains challenging. Astronomers are focusing on understanding the unusual orbital patterns of smaller objects in the Kuiper Belt, hoping they may eventually lead to Planet Nine’s precise location.

Anticipated Breakthroughs in Near Future

With growing advancements in observational technology and collaborations across the globe, scientists are optimistic. As new telescopes come online and data accumulates, researchers like Brown and Batygin believe that a definitive answer could emerge within the next decade. If discovered, Planet Nine would reshape our understanding of the solar system’s boundaries, marking a major scientific milestone in space exploration.

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Bio-Based Fibres Might Be A Bigger Environmental Threat Than Plastics

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November 6, 2024

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Bio-Based Fibres Might Be A Bigger Environmental Threat Than Plastics

A recent study has suggested that bio-based fibres, often marketed as environmentally friendly replacements for plastics, may pose greater ecological threats than previously assumed. Conducted by the University of Plymouth and the University of Bath as part of the £2.6 million BIO-PLASTIC-RISK project, the research reveals that these fibres, used in everyday items like clothing and wet wipes, can release microfibres that harm ecosystems, particularly through laundry wastewater, sewage sludge, and wear-induced fibre shedding.

Comparing Bio-Based Fibres with Conventional Plastics

In a detailed analysis, scientists compared the impact of conventional polyester with two common bio-based fibres, viscose and lyocell, on earthworms—species vital to soil health. The findings showed that bio-based materials might be significantly more hazardous. In lab tests, up to 80% of earthworms exposed to viscose fibres died, compared to 30 percent mortality among those exposed to polyester. When exposed to lyocell, 60 percent of earthworms did not survive. At lower, environmentally relevant exposure levels, viscose was linked to lower reproduction rates, while lyocell led to reduced growth and altered burrowing behaviours.

Importance of Rigorous Testing for New Materials

Dr. Winnie Courtene-Jones, a Lecturer in Marine Pollution at Bangor University and lead author of the study, pointed out the critical need for more comprehensive testing. She noted that while bio-based and biodegradable fibres are produced in large volumes—over 320,000 tonnes in 2022—insufficient data exists on their environmental impacts. “Our study underscores the importance of evidence-based approaches before rolling out new materials that aim to replace conventional plastics,” Dr. Courtene-Jones stated, highlighting that ecological impacts, especially on soil health, must be factored into evaluations of bio-based products.

Implications for the Future of Plastic Alternatives

This study, which builds on prior research linking biodegradable tea bags to increased earthworm mortality, arrives ahead of key discussions on plastic pollution at the upcoming United Nations conference in Busan, South Korea. Professor Richard Thompson, Head of the University of Plymouth’s International Marine Litter Research Unit, emphasised the need for an evidence-based strategy. He remarked, “Reducing plastic pollution is essential, but this research shows that substitute materials must undergo rigorous environmental testing to avoid unintended consequences.”

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